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hi.i have questions about O2 sensor.i have car seat cordoba 1.4 16V-volkswagen group.i am connect my hho generator in my engine.gas productions cca 1l-min.i was waiting voltage change on O2 sensor.but voltage absolutely unchange.its possible?when i add to engine hydrogen with oxigen,voltage on O2 sensor would be descend.but nothing.be good somebody explain?need i O2 sensor enhancer?my voltage by involvement 550-820mV.

thanks for advice